22284991 has 2 divisors, whose sum is σ = 22284992. Its totient is φ = 22284990.

The previous prime is 22284979. The next prime is 22285007. The reversal of 22284991 is 19948222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22284991 - 2⁷ = 22284863 is a prime.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 22284991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22284961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11142495 + 11142496.

It is an arithmetic number, because the mean of its divisors is an integer number (11142496).

Almost surely, 2^22284991 is an apocalyptic number.

22284991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22284991 is an equidigital number, since it uses as much as digits as its factorization.

22284991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 22284991 is about 4720.6981475201. The cubic root of 22284991 is about 281.4086791160.

The spelling of 22284991 in words is "twenty-two million, two hundred eighty-four thousand, nine hundred ninety-one".